Performance, Custom Renderes, Isolation, Bugfixes

This Update contains a number of smaller improvements, Performance fixes, QOL features and a the addition of renderes.

• Added an Index property to CharacterLocation
• Fixed the NullCoalescing Operator
• Added global Formatter "ParseBool" that will parse a string containing ether "true","yes","valid" or "1" to true otherwise to false.
• Added Isolation keyword. See: https://github.com/JPVenson/morestachio/wiki/Keywords#isolation---block
• Fixed an StackOverflow in Tokenizer
• Added IDocumentCompiler and IRenderer see: https://github.com/JPVenson/morestachio/wiki/IRenderer-and-IDocumentCompiler
• Performance improvement for Path handing in CompiledRenderer
• Performance improvement for Expression execution in CompiledRenderer
• Performance improvement for EachDocument loop
• Breaking Change: Removed the AbortGeneration property
• Breaking Change: Expressions no longer overwrites the ToString method but uses the DebuggerProxys ToString method
• Huge Performance Improvement with the usage of ReadOnlySpan<char> in the ByteCounterStream for compatible .Net versions
• TextInstructions are now added to the Content as a Child instead of being an distinct DocumentItem
• Breaking Change: Moved the ParserOptions property from ContextObject to ScopeData
• Bugfix: AsyncPartialStore now uses ValueTask where applicable
• EachDocument now reuses its Context object
• NumberExpression and StringExpression now evaluates its ContextObject in CompileTime instead of RenderTime
• Feature: It is now possible to overwrite the TargetStream directly when calling IRenderer.RenderAsync()
• Feature: Added ByteCounterTextWriter and ByteCounterStringBuilder for pure In-Memory generation. (both are way faster than the ByteCounterStream)
• Feature: All build-in ByteCounters overwrite the ToString method to to allow easy result-to-string generation
• Added .Net-Configuration transformation with Morestachio (WIP)